Improvement in motive powers for sewing-machines



DAVIDT. PITTENGER. Improvement in Mo tiv Power For Sewing Machines. No. 115,516,

Patented May 30, I871.

NI'IED S'ra'rns DAVID r. 'rrrrnnenn, or TRENTON, NEW JERSEY.

IMPROVEMENT IN MOTIVE POWERS FOR SEWlNG-MACHBNES.

pecification forming part of Letters Patent No. 115,516, dated May 30, 1871.

To all whom it may concern:

Be it known that I, DAVID T. Prrrnnena, of Trenton, in the county of Mercer and State of New Jersey, have invented a new and valuable Improvement in Motors for Sewing-Machines; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation ofthe same, reference being had to the annexed drawing making a part of this specification, and to the letters and figures of reference marked thereon.

Figure 1 of the drawing is an external end view of a sewinganachine with my device attached; Fig.2 isasectional view of the same;

and Figs. 3, 4, and 5 are details.

My invention relates to means for operating sewing-machines and consists in a novel con- 'struction and arrangement of devices intended to serve as an effective apparatus for the purpose mentioned. 1

The letter A of the drawing represents the table of a sewing-machine, to one end of which p I affix the driving-shaft B with the drum 0,

the coiled spring D within the drum, together with the ratchet and pawl and gear-wheels, as

shown. I also afiix a pulley, E, to the side of the bottom of said table, and connect the same with the drum 0 by means of the belt G. The

' letter H represents a weight adapted for attachment to the belt G at anypoint desired thereon,

by means of the slotted hook at. The slot in this hookjco is rectangular in form, and is a little largerin size than thebelt with which it is connected. It is also made with a beveled edge, as

shownon Fig. 4, and serves to clamp the belt in order to attach the weight at any position desired. For the purpose of raising the weight H I sometimes arrange a cord and pulley to the ceiling of the apartment, but for ordinary-use I'prefer to raise it by hand. This Weight H for which I have designed it is as an aid or adjunct to said spring.

It often occurs in practice that a sewingmachine requires greater motive power at one time than at another, as, for example, greater power is needed to sew leather or very thick closely-Woven cloth than ordinary fabrics. It is for this purpose that I desire the use of the weight. Whenever the power furnish ed by the coiled springis inadequate for the purposeI add .the weight to the belt. When not on duty the weight rests on the floor and the belt passes through the slot in the hook without hindrance therefrom.

In conjunction with the above-described apparatus for moving the sewing-machine I have invented and arranged the brake, shown specifically on Figs. 2 and 3 of the drawing. This brakeis constructed with a curved elastic plate, 0, friction-rollers a, lever s, and curved guard o.

It will be observed that the lever s is attached directly to the end of the spring-bar 0, while the guard 21 is made tight or loose at will by the thumb-screw y.

I claim as my invention-- m 1. The beveled slotted cam hook a and weight H for attachment to the belt, as an adjunct to the ordinary coiled-spring motion for sewing-machines, constructed, arranged,

and adapted for use, substantially as speci- 

